What are dental implants?
Dental implants consist of a titanium screw fixed into the mouth permanently which then can be used to support a crown, bridge or denture. The advantage of implants over more traditional options for replacing teeth are that they are fixed securely and permanently and don't require taking out at night, they wont involve damaging any adjacent teeth to secure in place and they look natural as if they are real teeth.
What other options are there to replace missing teeth?
Dentures may be used to replace multiple missing teeth and particularly if you have no teeth these can become quite loose fitting. This is where implants can be used to secure a denture in place and allow for a much less bulky option.
Another option for replacing missing teeth is to consider a bridge. This involves sticking a false tooth to another tooth to hold it in place. This is often a very good option to replace teeth as it is fixed securely and in place and doesn't require to be removed ever, however, it is very case dependent as it relies heavily on the surrounding teeth to be strong enough to support another tooth and also for the preparation of the teeth to be appropriate and not overly damaging.